Solution technique of UVA problem 727 Equqtion

Problem description:

Write a program that changes an infix expression to a postfix expression according to the following specifications.

 Input condition:

1.  The infix expression to be converted is in the input file in the format of one character per line, with a maximum of 50 lines in the file. For example, (3+2)*5 would be in the form: ( 3 + 2 ) * 5 
2.  The input starts with an integer on a line by itself indicating the number of test cases. Several infix expressions follows, preceded by a blank line. 
3.  The program will only be designed to handle the binary operators +, -, *, /. 
4.  The operands will be one digit numerals. 
5. The operators * and / have the highest priority. The operators + and - have the lowest priority. Operators at the same precedence level associate from left to right. Parentheses act as grouping symbols that over-ride the operator priorities. 
6.  Each testcase will be an expression with valid syntax

UVA solution 727 Equation

Problem description:
source: https://uva.onlinejudge.org/external/7/727.html

Write a program that changes an infix expression to a postfix expression according to the following specifications.

 Input condition:

1.  The infix expression to be converted is in the input file in the format of one character per line, with a maximum of 50 lines in the file. For example, (3+2)*5 would be in the form: ( 3 + 2 ) * 5 
2.  The input starts with an integer on a line by itself indicating the number of test cases. Several infix expressions follows, preceded by a blank line. 
3.  The program will only be designed to handle the binary operators +, -, *, /. 
4.  The operands will be one digit numerals. 
5. The operators * and / have the highest priority. The operators + and - have the lowest priority. Operators at the same precedence level associate from left to right. Parentheses act as grouping symbols that over-ride the operator priorities. 
6.  Each testcase will be an expression with valid syntax

Solution of 713 - Adding Reversed Numbers

Problem Description
source: https://uva.onlinejudge.org/external/7/713.html

The Antique Comedians of Malidinesia prefer comedies to tragedies. Unfortunately, most of the ancient plays are tragedies. Therefore the dramatic advisor of ACM has decided to transfigure some tragedies into comedies. Obviously, this work is very hard because the basic sense of the play must be kept intact, although all the things change to their opposites. For example the numbers: if any number appears in the tragedy, it must be converted to its reversed form before being accepted into the comedy play.

 Reversed number is a number written in arabic numerals but the order of digits is reversed. The first digit becomes last and vice versa. For example, if the main hero had 1245 strawberries in the tragedy, he has 5421 of them now. Note that all the leading zeros are omitted. That means if the number ends with a zero, the zero is lost by reversing (e.g. 1200 gives 21). Also note that the reversed number never has any trailing zeros.